Stream chemistry for Gwynns Falls at Glyndon (suburban) watershed BES ID 571-

In the Baltimore urban long-term ecological research (LTER) project, (Baltimore Ecosystem Study, BES) we use the watershed approach to evaluate integrated ecosystem function. The LTER research is centered on the Gwynns Falls watershed, a 17,150 ha catchment that traverses a gradient from the urban core of Baltimore, through older urban residential (1900 - 1950) and suburban (1950- 1980) zones, rapidly suburbanizing areas and a rural/suburban fringe. Our long-term sampling network includes four longitudinal sampling sites along the Gwynns Falls as well as several small (40 - 100 ha) watersheds located within or near to the Gwynns Falls. The longitudinal sites provide data on water and nutrient fluxes in the different land use zones of the watershed (rural/suburban, rapidly suburbanizing, old suburban, urban core) and the small watersheds provide more focused data on specific land use areas (forest, agriculture, rural/suburban, urban). Each of the gaging sites is continuously monitored for discharge and is sampled weekly for chemistry. Additional chemical sampling is carried out in a supplemental set of sites to provide a greater range of land use. Weekly analyses includes nitrate, phosphate, total nitrogen, total phosphorus, chloride and sulfate, total suspended solids, turbidity, fecal coliforms, temperature, dissolved oxygen and pH. Cations, dissolved organic carbon and nitrogen and metals are measured on selected samples. This dataset is for Gwynns Falls at Glyndon. This site samples drainage from approximately 81 ha of old and new suburban and suburbanizing land use. A detailed description of this site is posted at: http://md.water.usgs.gov/BES/ 01589180/. Streamflow data for this site are posted at: http://waterdata.usgs.gov/md/nwis/nwisman?site_no=01589180在巴尔的摩城市长期生态研究（Long-Term Ecological Research, LTER）项目，即巴尔的摩生态研究（Baltimore Ecosystem Study, BES）中，本项目采用流域方法评估综合生态系统功能。该LTER研究以格温斯福尔斯流域（Gwynns Falls watershed）为核心研究对象，该流域面积达17150公顷，涵盖从巴尔的摩城市核心区，历经1900-1950年建成的老旧城市居住区、1950-1980年建成的郊区，快速郊区化区域，直至城乡交错带的完整景观梯度。本项目的长期采样网络涵盖沿格温斯福尔斯河布设的4个纵向采样点位，以及若干位于格温斯福尔斯流域内部或邻近区域的小型（40-100公顷）子流域。纵向采样点位可提供流域内不同土地利用类型区（城乡交错带/郊区、快速郊区化区域、老旧郊区、城市核心区）的水体与养分通量数据；而小型子流域则可针对特定土地利用区域（森林、农田、城乡交错带/郊区、城市区域）提供更为聚焦的观测数据。所有水文监测点位均持续监测径流量，并每周开展水质化学采样。此外，项目还在补充布设的采样点位开展额外化学采样，以覆盖更广泛的土地利用类型范围。每周水质分析指标包括硝酸盐、磷酸盐、总氮、总磷、氯化物、硫酸盐、总悬浮颗粒物、浊度、粪大肠菌群、水温、溶解氧及pH值。部分精选采样样品还会测定阳离子、溶解性有机碳、溶解性有机氮及金属元素含量。 本数据集对应格伦登（Glyndon）境内的格温斯福尔斯点位。该点位的采样区域涵盖约81公顷的新旧郊区及郊区化土地利用类型的汇水范围。 该点位的详细描述可访问以下链接：http://md.water.usgs.gov/BES/01589180/。 该点位的径流量数据可访问以下链接：http://waterdata.usgs.gov/md/nwis/nwisman?site_no=01589180